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<html xmlns="http://www.w3.org/1999/xhtml">
    <head>
        <title>CSS Test: Margin collapsing - parent edge and element edge are the same when margins collapse</title>
        <link rel="author" title="Microsoft" href="http://www.microsoft.com/" />
        <link rel="reviewer" title="Gérard Talbot" href="http://www.gtalbot.org/BrowserBugsSection/css21testsuite/" /> <!-- 2012-08-15 -->
        <link rel="help" href="http://www.w3.org/TR/CSS21/box.html#collapsing-margins" />
		<link rel="match" href="margin-collapse-017-ref.xht" />

        <meta name="assert" content="When the top margin of a child box collapses with the top margin of its parent, then the margin-top edge of such child box is the same as the parent's and their respective content should be 'sitting' at the parent's border-bottom (in the testcase, the black line) assuming the same height value and the same padding-bottom value for the parent and its child box." />
        <style type="text/css">
            #div1
            {
                border-bottom: black solid 3px;
            }
            div div
            {
                height: 20px;
                margin-top: 60px;
                width: 60px;
            }
            #div2
            {
                background: red;
            }
            #div3
            {
                background: blue;
            }
        </style>
    </head>
    <body>
        <p>Test passes if the blue stripe is touching the line and there is <strong>no red</strong>.</p>
        <div id="div1">
            <div id="div2">
                <div id="div3"></div>
            </div>
        </div>
    </body>
</html>